logging之Nginx 理解访问日志栏

我了解此应用程序访问日志的所有列 - IP、日期、请求、响应代码和...除了下一列是我不了解的内容(在下面的示例中，177、4223、4356)。这代表什么？

66.249.65.159 - - [06/Nov/2014:19:10:38 +0600] "GET /news/53f8d72920ba2744fe873ebc.html HTTP/1.1" 404 177 "-" "Mozilla/5.0 (iPhone; CPU iPhone OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5376e Safari/8536.25 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" 
66.249.65.3 - - [06/Nov/2014:19:11:24 +0600] "GET /?q=%E0%A6%AB%E0%A6%BE%E0%A7%9F%E0%A6%BE%E0%A6%B0 HTTP/1.1" 200 4223 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" 
66.249.65.62 - - [06/Nov/2014:19:12:14 +0600] "GET /?q=%E0%A6%A6%E0%A7%8B%E0%A7%9F%E0%A6%BE HTTP/1.1" 200 4356 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" 

请您参考如下方法:

“响应代码”(即状态)之后的列是“发送的字节数”。

nginx 中的默认日志格式称为“组合”。它相当于下面的配置。

# nginx.conf 
http { 
  ... 
  log_format combined '$remote_addr - $remote_user [$time_local] ' 
                      '"$request" $status $body_bytes_sent ' 
                      '"$http_referer" "$http_user_agent"'; 
  ... 
}